Ok, so not actually a card, but from 1973-1977, Dean's Photo Service of San Diego produced a set of 5.5"x8.5" black & white photos of the Padres as stadium give-aways. Much like my local minor league hockey team does, a small selection of photos were released at a time in tandem with a post-game signing session by the players & coaches in question. These were very nice pieces, with great posed photos on the front and a surprisingly detailed player biography and complete career stats on the back of the later years. I snagged this photo in one of the rare appearances of this set on eBay:
Annoyingly, I missed the set the first time I saw it and it went for just around $30. Naturally Winfield is the only pricey part of the set. Recently both the 1973 & 1974 sets popped up on eBay, but the BuyItNow was well over $100 for each, so I'll just have to be satisfied with catching a glimpse.
Oddly, neither Beckett nor the Standard Catalog list all of these sets, so it took some detective work to realize all these sets even existed.

My Sportlots Store
Trading Card Database
CPBL Official Blog